The Beechmont Crest Online Guide to Organic Chemistry
ATOMIC NUMBER AND ATOMIC MASS
The atomic number of an element equals the number of protons in the nucleus of an atom of that element. Atomic number is abbreviated as (Z).
The sum of the number of protons and neutrons in an element is its atomic mass. Atomic mass is abbreviated as (A).
Symbols for the elements (C for carbon, H for hydrogen, etc.) are sometimes indicated with the atomic weight and number in the following form:
